Macro nutrients and micro nutrients are essential for the body to survive and function. But do you know why and in what quantities?
For instance, many people trying to lose weight assume that carbohydrates are the enemy, yet is it vital for gaining lean muscle. Think of your body as like a giant ecosystem (which it kind of is). The amount macro nutrients and micro nutrients which you need to put into your body through your diet are very finely balanced - if one part of your body doesn't get the nutrients it needs, all others can be affected, and nutrient deficiencies can lead to serious illness. The amount of certain nutrients your body needs also depends on how active you are.
Sound complicated? This helpful macro and micro nutrient infographic explains all.